package com.bobo.service.impl;

import com.bobo.mapper.VegetableMapper;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.bobo.constant.MessageConstant;
import com.bobo.constant.StatusConstant;
import com.bobo.dto.SetmealDTO;
import com.bobo.dto.SetmealPageQueryDTO;
import com.bobo.entity.Vegetable;
import com.bobo.entity.Setmeal;
import com.bobo.entity.SetmealDish;
import com.bobo.exception.DeletionNotAllowedException;
import com.bobo.exception.SetmealEnableFailedException;
import com.bobo.mapper.SetmealDishMapper;
import com.bobo.mapper.SetmealMapper;
import com.bobo.result.PageResult;
import com.bobo.service.SetmealService;
import com.bobo.vo.VegetableItemVO;
import com.bobo.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private VegetableMapper dishMapper;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDTO
     */
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //向套餐表插入数据
        setmealMapper.insert(setmeal);
        //获取生成的套餐id
        Long setmealId = setmeal.getId();
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //保存套餐和菜品的关联关系
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();
        PageHelper.startPage(pageNum, pageSize);
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id ->{
            Setmeal setmeal = setmealMapper.getById(id);
            if(StatusConstant.ENABLE == setmeal.getStatus()){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        ids.forEach(setmealId -> {
            //删除套餐中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }

    /**
     * 根据id查询套餐和套餐菜品关系
     * @param id
     * @return
     */
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getSetmealId(id);
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Transactional(rollbackFor = Exception.class)
    public void update(SetmealDTO setmealDTO){
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //修改套餐表执行update
        setmealMapper.update(setmeal);
        //套餐id
        Long setmealId = setmeal.getId();
        //删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(setmealId);
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
        setmealDishMapper.insertBatch(setmealDishes);
    }



    public void startOrStop(Integer status,Long id) {
        //起售时判断套餐是否有停售菜品，有停售菜品提示“套餐包含停售菜品，无法起售”
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Vegetable> vegetableList = dishMapper.getBysetmealId(id);
            if(vegetableList != null && vegetableList.size() > 0){
                vegetableList.forEach(dish -> {
                   if(StatusConstant.DISABLE==dish.getStatus()){
                       throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                   }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }
    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<VegetableItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
